781945966081 has 8 divisors (see below), whose sum is σ = 908799186240. Its totient is φ = 658879409328.

The previous prime is 781945966073. The next prime is 781945966097. The reversal of 781945966081 is 180669549187.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 781945966081 - 2³ = 781945966073 is a prime.

It is a super-2 number, since 2×781945966081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (781945966181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 946665406 + ... + 946666231.

It is an arithmetic number, because the mean of its divisors is an integer number (113599898280).

Almost surely, 2^781945966081 is an apocalyptic number.

It is an amenable number.

781945966081 is a deficient number, since it is larger than the sum of its proper divisors (126853220159).

781945966081 is a wasteful number, since it uses less digits than its factorization.

781945966081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1893331703.

The product of its (nonzero) digits is 26127360, while the sum is 64.

The spelling of 781945966081 in words is "seven hundred eighty-one billion, nine hundred forty-five million, nine hundred sixty-six thousand, eighty-one".